Greg Sargent: Trump's latest claim about the Texas shooting is disingenuous nonsense

It has become an internet meme that Donald Trump favors extreme vetting for arriving immigrants, but not for would-be gun buyers, and Tuesday in South Korea, Trump was confronted by a question about this contrast. It produced a useful answer — one that once again illustrated the deep rot of bad faith at the core of his approach to difficult policy questions.It’s being widely reported that the Air Force failed to follow the proper policies that would have barred Devin Patrick Kelley,